In a mixer circuit with a balanced frequency mixer with varactor diodes, a first input signal that exhibits a first input frequency can be fed to the frequency mixer via a first input. Furthermore, a second input signal that exhibits a second input frequency can be fed to the frequency mixer via a second input. The frequency mixer has at least two amplifier elements fashioned as varactor diodes. These amplifier elements mix the input signals with one another into a mix signal with a first signal component and a second signal component. The first signal component exhibits a first component frequency, the second signal component a second component frequency. The first component frequency is equal to the sum of the first and second input frequencies, the second component frequency is equal to the difference of the first and second input frequencies. An output signal that contains at least one of the signal components can be tapped via the output. The frequency mixer is fashioned as a balanced frequency mixer in which at least the second input and the output are decoupled from one another. The second input frequency is a multiple of the first input frequency. An adjustment circuit for adjustment of an operating point of the varactor diodes is connected in parallel with each varactor diode.